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package main
import (
"log"
"reflect"
"github.com/sgreben/jp/pkg/data"
"github.com/sgreben/jp/pkg/draw"
"github.com/sgreben/jp/pkg/plot"
)
func scatterPlotData(xv, yv []reflect.Value) (x, y []float64) {
for i := range xv {
if xv[i].IsValid() && xv[i].CanInterface() {
xvi, ok := xv[i].Interface().(float64)
if ok {
x = append(x, xvi)
}
}
}
for i := range yv {
if yv[i].IsValid() && yv[i].CanInterface() {
yvi, ok := yv[i].Interface().(float64)
if ok {
y = append(y, yvi)
}
}
}
return
}
func scatterPlot(xv, yv []reflect.Value, c draw.Canvas) string {
x, y := scatterPlotData(xv, yv)
chart := plot.NewScatterChart(c)
data := new(data.Table)
data.AddColumn("x")
data.AddColumn("y")
n := len(x)
if len(y) > n {
n = len(y)
}
if len(y) == 0 {
log.Fatal("no valid y values given")
}
// If no valid xs are given, use the indices as x values.
if len(x) == 0 {
x = make([]float64, len(y))
for i := 0; i < len(y); i++ {
x[i] = float64(i)
}
}
for i := 0; i < n; i++ {
data.AddRow(x[i%len(x)], y[i%len(y)])
}
return chart.Draw(data)
}
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